class_docstr: Holds the inventory of 2D pieces and performs cutting.
  :param max_pieces_in_inventory: Size of the inventory. If full, the oldest pieces get discarded.
  :param raw_piece_size: Size of a fresh raw (= full-size) piece.
  :param inventory_events: Inventory event dispatch proxy.
docstr: Log inventory statistics once per step
docstr_tok: ["Log","inventory","statistics","once","per","step"]
code: def log_step_statistics(self):
      """Log inventory statistics once per step"""
      self.inventory_events.pieces_in_inventory(self.size())
  
file_path: maze/tutorials/tutorial_maze_env/part05_reward/env/inventory.py
imports: from .events import InventoryEvents
  from .maze_action import Cutting2DMazeAction
label_desc: Use image node_id 7 for calling the Inventory obj's underlying member method code with example usage: obj.log_step_statistics() without return types